Process for preparing paving or building blocks.



ROCKY G ANADA GANGEWERE, OF SOUTH BETHLEHEM, PENNSYLVANIA.

PROCESS FOR PREPARING PAVD JG OR BUILDING BLOCKS.

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed July 17, 1907. Serial No. 884,253.

To all whom it may concern:

Be it known that I, Room CANADA GANGEWERE, a citizen of the United States, residing at South Bethlehem, in the county of Northampton and State of Pennsylvania, have invented a new and useful Processfor Preparing Paving or Building Blocks, of which the following is a specification.

This invention relates to afljclgior pav- 10 ing, building or other purposes and has for its object the manufacture of building bricks from furnace slag mixed with more or less cement and preferably by a dry process, the bricks bein formed under heavy pressure.

in'fo'r'nnng my sla with the desired portion of em 1 subject the mixture to heavy pressure, preferably that of a h drauh'c press thus moldin the bricks b a r rocess orming a very hard, durab e an rero brick ada ted for any pur ose for w ch such a brick will be suitab e. ,By this means a brick is also produced which is capable of withstanding considerable pressure without being crushed or broken. The amount of cement em loyed can vary accordin to the use to whic the brick is to be place but in usual practice I will use about 12 parts of pulverized slag to one of cement. It will also be understood that Portland cement is used and that if a 0010 1'10 1s eslre any suitable colorin matter may be added.

In preparimdsition of granulated furnace slag and Portland cement or other cement, I employ new or fresh slag.

The slag as it is leaving the furnace is ranulated by having the same deposite into metal cars to which the proper amount of water is added said wa er emg a e 1 .tX-amin? 6/9 A W. p

the slag wlifie 1n the cars, and the same 3311' 40 granulate and is then carrie the cars, and the cement mixed t erevfith while the sla is be? g pmyerized and without the a 1t1on o more we er. The pulverized slag and cement is then run through two hundred mesh to the square inch after which the mixture is passed through the second mixing process to secure uniform disposition of the cement and slag and is then assed to a hydraulic or other press and ormed into blocks, bricks or other building or pavin material. After the blocks, bricks or s abs have left the presses they are moistened either by dipping into water or by sprinklin in order to increase the durabilit of the look.

at I claim is A process of making building or aving blocks consistin in conveying fresh s ag directly from a bfast furnace to a pulverlzer, applyingi water to said slag between the furnace an the pulverizer thereby granulatin the slag, mixing Portland cement with sai granulated slag, during ulverization of the slag, conveying the pu verized mixture to suitable ses and pressing the same into b oc s, and moistening said blocks after they come from the press.

, ROCKY CANADA GANGEWERE. Attest:

A. L. MGLEOD, W. D. E. ALLEN.

1e cars to a drymg pan into which it is um ed from 

